Feed-controlling device.



G. H. GiLMAN. FEED CONTROLLING DEVICE. APPLICATION F|LED Dc.26.1914.f

PatentedAug. 24, 1915.

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FEED-CONTBOLLING DEVICE.

Specicatioxi of Letters Patent.

Patente .i Aug. 2d,

Application filed ecember 26, 1914. Serial No. 879,02*@

T0 all Iwhom it may concern:

Be it known that Gnonen li. GLLMAN, a citizen oi the United States, a resident of Claremont, Sullivan county, lil ew Hampshire, have invented an improvement in Feed-Controlling Devices, of which the following description, in connection with the accompanying drawings, is a speciiication, like characters on the drawings representinOj like parts.

z`This invention relates to feed controlling devices for tools, and more especially, though not exclusively, to means for controlling the action of the pressure fluid feed cylinder, and piston of a pressure iiuid impact tool, such vfor example as a stoping rock drill.

My invention will be best understood by reference to the following description, when taken in connection with the yaccouipanying drawings ofy two illustrative embodiments thereof, while its scope will be more particularly pointed out in the appended claims. y

in the' drawings, Figure l is a central,

longitudinal sectional view, partly in eleva-` tion, of one form of stoping drill having a feed-controlling device embodying my invention FigQ is a central, longitudinal sectional view, partly in elevation, of another form of' stoping drill having a feed-con trolling device embodying my invention; Fig. 3 is a sectional view, on an enlarged scale, on line 3 3 of Fig. 2, looking toward the left; and Fig. 4 is a sectional view, Yon an enlarged scale, on line 4 4 of Fig. 2, looking toward the right.

Referring to the drawings, and to both embodiments of my invention which i have selected for illustration, l have there shown two examples of stoping drills, each comprising Work-performing means including a cylinder 5, having therein a piston 6, provided With a reduced extension or hammer .bar 7, adapted to deliver a succession of blows upon a suitable impact-receiving niember, herein in the forni of a striking pin 8, the latter in turn acting upon the inner"end of an appropriate drill-bit 9 in a familiar manner, to cause thedrill by its-percussive action to drill a hole in the rock. The cylinderv 5 is provided with a rear Acylinder head l0, which may be ci any other appropriate construction, but herein constitutes a mounting for a throttle valve 11 for controlling the admission of the pressure duid to the tool.

Asa means for advancing the impec tor, thereby to press the drill-bit ageu work, the tool may be provided with propriate feeding means, as for eH pressure fluid fee-ding means cofeed piston and cylinder secured, part to the rear cylinder head, and

arranged to engage suitable for example the iioor or side wail oi.' the tunnel or other space in the mine o-' quarry where the tool is heing operated.

In the form shown in i'ig. l, the :feeding means comprises a feed cylinder i2,- .secured to-the' cylinder head l0, and-having at its rear end a cylinder head 13, through which passes a piston rod 14;, the latter being se-1 cured at one end to the cylinder head l), and.

at its other end to a feed piston 20 working in the feed cylinder i7. in t iis orrn, the

piston rod and feed piston are provided with an axial passage 2l, through which. the pressure fluid passes to the rear end oi the cylin der, where it may act upon the rear end othe feed pistonu in this instance, the :feed cylinder 17 is rovided 'with a spur 22 for engagement with the Wall or "door of the mine or quarry. I y

Both formsof stoping drills, as thus :tar described, are of well known construction, and require no further description. l will' now describe the feed controlling means, whereby the feed may be regulated, or altogether stopped at will.

ln a great many cases, the rocir which is encountered is comparatively soit, and docs not require the full pressure of the feeding device to keep the drill up to its work. .in many cases, also, soit and seamy spots in the rockN are encountered, and when this is the case, there is a tendency of 'the drill to jump forward suddenly under the influence ofits feeding device, thus causing the drillbit to become jammed.4

As a means for controlling the feed, and to provide for the manual regulation. oit-the same, l have herein provided a frictionei "i lfso restraining device, which is similar in its construction as applied to both -forms of stoping drill illustrated,'and a detailed de- I* scription of`l that which is more fully illustrated in Figs. 2, 3 and 4, will sufiice for both. l

Referring to Figs. 2, 3 and 4, the restraining device selected for illustration comprises an elastic helically-coiled membery 23, encircling the piston rod 19 and adapted to engage the latter with a greater or lesser degree of pressure, whereby its feed restraining capacity' may be varied. To this end, the coiled spring-like member is hereininclosed in a casing 24 attached to the cylinder head 18 in any appropriate manner., as by Within thisthreading the two together.

. casing is journaled a sleeve 25, to'which one end of the helically-coiled member fixed, it`

is herein bent radially to form a lug 28, which enters a slot 29 provided i'n thecas- -ing 24.

It will now be apparent that by rotating the sleeve 25, the helically-coiled member 23 l lmay be flexed and caused to expand or contract at will, according to the direction in l which the sleeve is rotated. In other words,

thediamet'er of the coil or coils may be enlarged vor reduced by subjecting it to a torsional stress in the proper direction, thus varying the degree of pressure which it will Vexert'upon the piston rod 19, owing tothe fact that it is. wrapped about the latter in .frictional contact therewith. It will be l.readily lappreciated that by this means, the

d rictional resistance may bel obtained, and-maybe regulated at will, without causi ing "a"iside thrust to be exerted against the piston rod. This, of course, is due to `the fact that the coils engage the piston rod with Y substantially equal pressure throughout its circumference.

The sleeve 25 may be rotated and held v'fixed in the .desired position of adjustment by any suitable means, and as herein shown,

the sleeve is in the form of a Worm gear,v meshing with a worm v30. The latter is herein suitably formed on a worm-shaft '31,

whose inner end is journaled in the casing- 24, and Whose outer' end is journaled in a bushing 32and is provided beyond thelatvter with a suitable handle-33.' The workman, by grasping the handle 33, may turn the worm 30, thereby turning the Worm-gear ring or sleeve 25, and hence winding o'r unwinding the spring-like coiled member 23, and causing the latter to engage the piston rod with a greater or less degree of effectiveness.V

is to say, it is securely locked in the desired position of adjustment, without further thought, upon the completion of the adjusting operation. v

Referringto the form shown in Fig. 1, the

construction is the same in all essential particulars as that already described, except of the feed cylinder.

In the Operation of either form of the invention, the f ull effect of the feeding means may be obtained by turning the regulating handle to a position whichjvill cause the helically-coiled member to become` entirely relaxed. If, however, the character of the rock should be such as to require a less degree of pressure, the action of the feeding device may be regulated toA a nicety by simply turning ,the regulating handle to the proper extent. If, during the operation of the'drill, the drill-bit should. strike a soft spot and tend to jump forward suddenly, the restraining device imposes such a restraint thereon as to prevent the drill-bit from becoming wedged, or jammed.

While I have herein shown and described two specific embodiments of my invention for illustrative purposes, andhave disclosed .that it is attached to the rear cylinder head and discussed injdetail the construction and.

arrangement incidental to two specific ap lplications thereof, it-is to be understood that the invention is limited neither to the mere details or relative arrangement of parts, nor

to its specific embodimentsherein shown, but. .that extensive deviations fromthe illus- 2. The .combination With work-performing means and means for feeding said Workperfor'mi-ng -means; of` feed-controlling means including an expansible and contractiblev feed-restraining memlierfand means for expanding and contract-ing said member td vary its feed-restraining capacity.

3. The combination with work-performing means and means for feeding said workperforming means;= of feed-controlling means including a coiled feed-restraining.`

member, and means f or enlarging and reducing the coll or coils of said member to vary its feed-restrainingcapacity.

4. The cembination with work-performlcompiising ing means and means for feeding said work-v performing means; yof 'feed-controlling means including a helical feed-restraining member, and means for subjecting said member -to a torsional stress to change its feed-restraining capacity.

l. The combination with feeding means members; of means for regulating their telescopic .novement including an elastic member engmging one of said telescopically arranged members, and means for flexing said elastic member to cause it to engage with a' greater or less degree of effectiveness.

6.V The combination with feeding means comprising two telescopically arranged members; of means for regulating tlieirtel-` escopic movement including an elastic member encircling one of said telescopically arranged members, and means for varying the diameter of said elastic member to vary its feed-regula effect.

7. |The combination with feeding means' comprising two telescopicallv arranged members, of means for regulating their 'telescopic movement including an expansible and contractible feed-restraining member encircling one of said telescopically arranged members, and means for expanding and Contracting said feed-restraining mem-vv ber to vary its feed-restraining capacity.

8. The combination with feeding means comprising. two telescopically arranged members; of means for regulating their telescopic movement including a coiled feedrestraining member encircling one of said telescopi arranged members, and means for enlarging or reducing the coil or coils of said feed-restrainingmember to Vary the feed-restraining capacity.

9. The combination with feeding means comprising two telescopicallv arranged members; of means for regulating theirv telescopic movement including ahelical feed-- Vrestraining member encircling one of said telescopicallv arranged members, and means for subjecting said feed-restraining member to a toi-sional stress to change its feed-ie" straining capacity.

l0. The combination with twotelescopi-vl cally arranged members ;-of means for regulating their telescopic movement including a helical member coiled. about one' of said telescopicallv arranged members and having one poi-tion held fixed as to circumferential movement, and means connected to another portion of said helical member to subject the saine to a torsional stress. y

one portion held fixed as to circumferential movement, and means including a ring cotwo tclescopically arrangedA axially disposed with relation to said helical member to subject the same to a torsional stress.

12. The combination with two telescopically1 arranged members; of means for regulating their telescopic movement including a helical member coiled about one of said telescopically arranged members and having one portion held fixed as to circumferential movement, and means including a toothed ring coaxially disposed with relation to said helical member to subject the same to a torsional stress.

13. The combination with two telescopically arranged members; of means for regulating their telescopic movement including a helical member coiled about one of said telescopically arranged members and having one portion held fixed as to circumferential movement, and mea-ns connected to another portion of said helical member to subject the same to torsional stress and to hold the same xed in the desired condition of stress.

14. rThe combination with two telescopically arranged members; of means for regulating their telescopic movement including a helical member coiled about one lof said telel scopically arranged members and having one portion held fixed as to circumferential movement, and means including a toothed ring coaxially disposed with relation to'said helical member and a device engaging the teeth of said ring to subject said helical a' helical member coiled about one of said telcscopicallv arranged members and having one portion held fixed as to circumferential movement, a gear secured to another portion of said helical member and coaxially disposed with relation thereto, and another gear meshing with the first-mentioned gear to a turn the latter.

.17. vThe combination with two telescopically arranged members; of 'means for regulating their telescopic movement including a helical member coiled about one of said telescopically arranged members and having one portion held fixed as to circumferential movement, a worm gear secured to another portion of said helical-member and coaxially disposed with relation thereto, and a worm meshing with said Worm gear.

iso

Ascopically arranged members and v having one portion held fixed as to circumferential movement, a worm gear secured to another portion of said helical member and coaXially disposed with relation thereto, a worm meshing with said Worm-gear, and a casing inclosing saidhelical member, said worm `gear and said worm.

l19. The combination with two telescopically arranged members; of a helical mem-A ber coiled labout one of said telescopically arranged members, a worm gear coaxially disposed with relation to said helical member, a Worm meshing with said worm-gear,

Yand a casing inc losi'ng said helical member, said worm-gear and said worm, lsaid casing and saidA worm gear being each provided with a slot extending lengthwise of the axis: 'of said helical member, and the latter being provided adjacent its opposite ends with projections extending into said slots, respec-v tively.

In testimony whereof, I have signed my name to this specification, in the'presence of two subscribing Witnesses.`

GEORGE H. GILMAN.

Witnesses: y M. A. HENRY v E. A. TRACY. 

